Correct type hints for client certificate

tusclient/client.py

@@ -1,4 +1,4 @@
-from typing import Dict, Optional, Tuple
+from typing import Dict, Optional, Tuple, Union
 
 from tusclient.uploader import Uploader, AsyncUploader
 
@@ -16,18 +16,18 @@ class TusClient:
             along with every request made by the cleint to the server. This may be used to set
             authentication headers. These headers should not include headers required by tus
             protocol. If not set this defaults to an empty dictionary.
-        - client_cert (tuple):
+        - client_cert (str|tuple[str,str]):
             Path of PEM encoded client certitifacate and optionally path to PEM encoded
             key file. The PEM encoded key of the certificate can either be included in the
             certificate itself or be provided in a seperate file.
             Only unencrypted keys are supported!
     :Constructor Args:
         - url (str)
         - headers (Optiional[dict])
-        - client_cert (Optional[Tuple[str, str]])
+        - client_cert (Optional[str | Tuple[str, str]])
     """
 
-    def __init__(self, url: str, headers: Optional[Dict[str, str]] = None, client_cert: Optional[Tuple[str, str]] = None):
+    def __init__(self, url: str, headers: Optional[Dict[str, str]] = None, client_cert: Optional[Union[str, Tuple[str, str]]] = None):
         self.url = url
         self.headers = headers or {}
         self.client_cert = client_cert

tusclient/uploader/baseuploader.py

@@ -1,4 +1,4 @@
-from typing import Optional, IO, Dict, Tuple, TYPE_CHECKING
+from typing import Optional, IO, Dict, Tuple, TYPE_CHECKING, Union
 import os
 import re
 from base64 import b64encode
@@ -103,7 +103,7 @@ def __init__(self, file_path: Optional[str] = None, file_stream: Optional[IO] =
                  url_storage: Optional[Storage] = None,
                  fingerprinter: Optional[interface.Fingerprint] = None,
                  upload_checksum=False,
-                 client_cert: Optional[Tuple[str, str]] = None):
+                 client_cert: Optional[ Union[str, Tuple[str, str] ]] = None):
         if file_path is None and file_stream is None:
             raise ValueError(
                 "Either 'file_path' or 'file_stream' cannot be None.")